You will have to (i) impress to be a thorough gentleman, (ii) be promising in your words and act to prove strong in sex (capable to perform arousing pre-sex act, followed by performing hard high speed fuck strokes with robust tool staying for long before profusely ejaculating hot and thick semen deep inside the cunt) for giving her multi-orgasmic peaks, and (iii) assure to maintain the confidentiality about your enjoying act with her.

Nice question, sweet question, but I cant reply.
This is one area I am really good at, I cant share my secret with everyone. It took me long to develop my sure shot signature move, why should I share and make your life easier?
Try find your own way.

Dear tamil boy.Having sex with a married woman is justified only if there is her husband consent.You should not have sex with a married woman by cheating her husband.What enemity do you have with her husband that you want to emotionally hurt him if he comes to know about your affair with his wife.As it is also very difficult to convince any person to allow you to have sex with his wife unless you are lucky enough to find a couple with an open relationship.Therefore it's better to find a young girl of your age and make her your girlfriend and If you are so much interested in matured women then look for an widow or a divorcee lady around and try on her.